MESON Chess Problem Database

Problem Display
PID: 67663 (QB2Kb2/3P4/R1npkpn1/1bp2p2/2p2p2/1N5N/4B3/3R4 w - - 0 1)

Sedgwick, Stanley

Chess, 1948

QB2Kb2/3P4/R1npkpn1/1bp2p2/2p2p2/1N5N/4B3/3R4

#2

9 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Sa5
      • 2.Qd5#
    • 1...Sce5
      • 2.Sxc5#
      • 2.Qd5#
    • 1...Sa7
      • 2.Qd5#
    • 1...Sxb8
      • 2.Qd5#
    • 1...Sd8
      • 2.Qd5#
    • 1...Sge5
      • 2.Sxf4#
    • 1...d5
      • 2.d8S#
  • Tries
    • 1.Sxc5+?
      • 1...dxc5
        • 2.d8S#
      • 1...Ke5!
    • 1.Bxc4+?
      • 1...Ke5
        • 2.Re1#
      • 1...d5
        • 2.Bxd5#
        • 2.d8S#
      • 1...Bxc4!
    • 1.Qxc6?
      • threat
        • 2.Qd5#
      • 1...Ke5
        • 2.Qd5#
      • 1...Se7
        • 2.Qxd6#
      • 1...Bxc6!
  • Keys
    • 1.Re1!
      • threat
        • 2.Bxc4#
      • 1...Kd5
        • 2.Bf3#
      • 1...Ke5
        • 2.Bf3#
        • 2.Bxc4#
      • 1...cxb3
        • 2.Bc4#
      • 1...Sce5
        • 2.Sxc5#
      • 1...Sge5
        • 2.Sxf4#
      • 1...c3
        • 2.Bc4#
      • 1...d5
        • 2.d8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • S(f);OGATE,P_PINP(F),P_SPINP(g)::QAB1(G)
    • S(f);OGATE,P_PINP(F),P_SPINP(g),XB(H)::QAB1(G)
    • S(j);N_GUARD,SBLOCK::S(D),XP(b)
    • P(g);P_SPINS(f)::P=S
  • Tries
    • Try
      • S(C);CHECK,XP(d)
      • Vars
        • P(g);N_GUARD,P_SPINS(f),XS(C)::P=S
      • Refutation
        • K(h);P-FLIGHT,P_SPINP(g)
    • Try
      • B(B);CHECK,XP(a)
      • Vars
        • K(h);P-FLIGHT,P_SPINP(g)::R(A)
      • Refutation
        • B(c);XB(B)
    • Try
      • Q(G);P_PINP(g),XS(f)
      • Threat
        • QAB1(G)
      • Vars
        • K(h);P-FLIGHT::QAR1(G)
        • S(j);S_CUTB(k)::QAR1(G),XP(g)
      • Refutation
        • B(c);N_SPINP(g),P_PINP(F),XQ(G)
  • Actual
    • R(A);
    • Threat
      • R(A)+B(B),DCHECK,XP(a)
    • Vars
      • K(h);P_SPINS(f),S_FLIGHT::B(B)
      • P(a);XS(C)::R(A)+B(B),DCHECK
      • S(f);P_PINP(F),P_SPINP(g),SBLOCK::S(C),XP(d)
      • S(j);N_GUARD,SBLOCK::S(D),XP(b)
      • P(a);::R(A)+B(B),DCHECK
      • P(g);P_SPINS(f),SBLOCK::P=S
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